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Ch. Prathap,V. V. Ramana Kumar,M. Venkata Rao,P. Nagaiah,S. Rama Rao K.,B. David Raju 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
With the aim of understanding the influence of CeO2 on MgO, Al2O3 and MgAl2O4 in CO2 assistedoxidative dehydrogenation of ethylbenzene to styrene was attempted and the results conveyed that theMgAl2O4 spinel supported CeO2 (CeO2/MgAl2O4) catalyst exhibited superior activity with 80% yield ofstyrene and in apart activity consistency up to 50 h of time-on-stream, revealing the establishment ofsynergism in CeO2/MgAl2O4, ascertained from XRD, BET Surface area, FT-IR, H2-TPR, UV–vis DRS, XPS, TPDand HRTEM techniques, acid-base characteristics of MgAl2O4, smaller particle size of CeO2 and its highdispersion are responsible for elevated activity, stability and regenarable capability.
BOUNDS ON THE GROWTH RATE FOR THE KUO PROBLEM
S. LAVANYA,V. GANESH,G. VENKATA RAMANA REDDY The Korean Society for Computational and Applied M 2023 Journal of applied mathematics & informatics Vol.41 No.2
We consider Kuo problem of hydrodynamic stability which deals with incompressible, inviscid, parallel shear flows in the 𝛽-plane. For this problem, we derived instability region without any approximations and which intersects with Howard semi-circle region under certain condition. Also, we derived upper bound for growth rate and amplification factor of an unstable mode and proved Howard's conjecture.
On homogeneous shear flows with bottom cross section
S. Lavanya,V. Ganesh,G. Venkata Ramana Reddy 한국전산응용수학회 2023 Journal of applied mathematics & informatics Vol.41 No.5
We consider inviscid, incompressible homogeneous shear flows of variable cross section known as extended Rayleigh problem. For this extended Rayleigh problem, we derived instability region which intersect with semi-circle instability region under some condition. Also we derived condition for stability , upper bound for amplification factor and growth rate of an unstable mode.
On the bounds for Wave Stability of Stratified Shear Flows
S. Lavanya,V. Ganesh,G. Venkata Ramana Reddy 한국전산응용수학회 2024 Journal of applied mathematics & informatics Vol.42 No.1
We consider incompressible, inviscid, stratified shear flows in $\beta $ plane. First, we obtained an unbounded instability region intersect with semi-ellipse region. Second, we obtained a bounded instability regions depending on Coriolis, stratification parameters and basic velocity profile. Third, we obtained a criterion for wave stability. This has been illustrated with standard examples. Also, we obtained upper bound for growth rate.
Sudheer Betha,B. Pamula Reddy,P. V. Swamy,M. Mohan Varma,D. Basava Raju,Venkata Ramana Murthy Kolapalli 한국약제학회 2015 Journal of Pharmaceutical Investigation Vol.45 No.6
The present work deals with design of zero order sustained release nateglinide matrix tablets by application of statistical design using response surface methodology as a tool. Central composite design was used to investigate the effect of two independent formulation variables (at three levels) such as Kollidon SR (X1), PVP K 30 (X2) on dependent variables viz. time required to release 30 % (T30, Y1), percentage drug released at 6th hour (DR6, Y2) and time required to release 90 % (T90, Y3) of drug. Wet granulation technique was employed for tablets preparation. The result showed that release pattern of the optimized formulation was almost equal to the statistically predicted values. There was no chemical interaction observed between drug and polymer based up on FTIR and DSC results. In vitro release studies were performed in 0.1 N HCl containing 0.5 % SLS for first 2 h followed by pH 6.8 phosphate buffer containing 0.5 % SLS. Stability studies were performed to statistically optimized formulation. The release pattern from statistically optimized formulation was followed zero order kinetics with non- Fickian process as drug release mechanism. Pharmacokinetic studies were performed to optimized formulation in comparison with nateglinide suspension in rabbit as animal model. The results of in vivo studies revealed the % relative bioavailability of statistically optimized formulation was found to be 68.87 %.
Swathi Tummalapalli,Ravi Sekhar M,Naga Malleswara Rao Inturi,Venkata Ramana Murthy V,Rama Krishna Suvvari,Lakshmi Prasanna Polamarasetty 대한치과마취과학회 2023 Journal of Dental Anesthesia and Pain Medicine Vol.23 No.4
Background: Third molar extraction is the most commonly performed minor oral surgical procedure in outpatient settings and requires regional anesthesia for pain control. Extraction of the maxillary molars commonly requires both posterior superior alveolar nerve block (PSANB) and greater palatine nerve block (GPNB), depending on the nerve innervations of the subject teeth. We aimed to study the effectiveness of PSANB alone in maxillary third molar (MTM) extraction. Methods: A sample size comprising 100 erupted and semi-erupted MTM was selected and subjected to study for extraction. Under strict aseptic conditions, the patients were subjected to the classical local anesthesia technique of PSANB alone with 2% lignocaine hydrochloride and adrenaline 1:80,000. After a latency period of 10 min, objective assessment of the buccal and palatal mucosa was performed. A numerical rating scale and visual analog scale were used. Results: In the post-latency period of 10 min, the depth of anesthesia obtained in our sample on the buccal side extended from the maxillary tuberosity posteriorly to the mesial of the first premolar (15%), second premolar (41%), and first molar (44%). This inferred that anesthesia was effectively high until the first molars and was less effective further anteriorly due to nerve innervation. The depth of anesthesia on the palatal aspect was up to the first molar (33%), second molar (67%), and lateromedially; 6% of the patients received anesthesia only to the alveolar region, whereas 66% received up to 1.5 cm to the mid-palatal raphe. In 5% of the cases, regional anesthesia was re-administered. An additional 1.8 ml PSANB was required in four patients, and another patient was administered a GPNB in addition to the PSANB during the time of extraction and elevation. Conclusion: The results of our study emphasize that PSANB alone is sufficient for the extraction of MTM in most cases, thereby obviating the need for poorly tolerated palatal injections.
Pratiksha Behera,Madhusmita Mahapatra,Arman Seuylemezian,Parag Vaishampayan,V. Venkata Ramana,Neetha Joseph,Amaraja Joshi,Yogesh Shouche,Mrutyunjay Suar,Ajit K. Pattnaik,Gurdeep Rastogi 한국미생물학회 2018 The journal of microbiology Vol.56 No.7
The taxonomic position of a Gram-stain-negative, rod-shaped bacterial strain, designated PI11T , isolated from the rhizospheric sediment of Phragmites karka was characterized using a polyphasic approach. Strain PI11T could grow optimally at 1.0% NaCl concentration with pH 7.0 at 30°C and was positive for oxidase and catalase but negative for hydrolysis of starch, casein, and esculin ferric citrate. Phylogenetic analysis of 16S rRNA gene sequences indicated that the strain PI11T belonged to the genus Pseudomonas sharing the highest sequence similarities with Pseudomonas indoloxydans JCM 14246T (99.72%), followed by, Pseudomonas oleovorans subsp. oleovorans DSM 1045T (99.29%), Pseudomonas toyotomiensis JCM 15604T (99.15%), Pseudomonas chengduensis DSM 26382T (99.08%), Pseudomonas oleovorans subsp. lubricantis DSM 21016T (99.08%), and Pseudomonas alcaliphila JCM 10630T (99.01%). Experimental DNA-DNA relatedness between strain PI11T and P. indoloxydans JCM 14246T was 49.4%. The draft genome of strain PI11T consisted of 4,884,839 bp. Average nucleotide identity between the genome of strain PI11T and other closely related type strains ranged between 77.25–90.74%. The polar lipid pattern comprised of phosphatidylglycerol, diphosphatidylglycerol, and phosphatidylcholine. The major (> 10%) cellular fatty acids were C18:1 ω6c/ω7c, C16:1 ω6c/ω7c, and C16:0. The DNA G + C content of strain PI11T was 62.4 mol%. Based on the results of polyphasic analysis, strain PI11T was delineated from other closely related type strains. It is proposed that strain PI11T represents a novel species of the genus Pseudomonas, for which the name Pseudomonas sediminis sp. nov. is proposed. The type strain is PI11T (= KCTC 42576T = DSMZ 100245T).